Value List

With VALUELIST_REQUEST request the client can get the list of OPC UA Variables described in OpcUaClient Configuration Settings.

Value List Request

Field		Description
Header
	MessageType	Must be VALUELIST_REQUEST.
	ClientHandler	See Message Format.
Body		Empty.

Value List Response

Field		Description
Header
	MessageType	Must be VALUELIST_RESPONSE.
	ClientHandler	See Message Format.
Body
	@Variables	The list of the variable names.

Status Codes

Status Code	Description
BadInternalError	The server failed to process the request due to internal error.

Example in Python

import websocket
import json

msg = {
  'Header': {
    'MessageType':'VALUELIST_REQUEST',
    'ClientHandle':'1'
  },
  'Body': {}
}

ws = websocket.create_connection('ws://127.0.0.1:8081')
ws.send(json.dumps(msg))
resp = ws.recv()
json.loads(resp)  #=> {
                  # 'Header': {
                  #   'ClientHandle': '1',
                  #   'MessageType': 'VALUELIST_RESPONSE'
                  # },
                  #
                  # 'Body': {
                  #   'Variables': [
                  #     'Var1',
                  #     'Var2', ..
                  #   ]
                  # }
                  #}